Axisymmetric model of the ionized gas in the Orion Nebula

Journal Article · Sat Jun 01 00:00:00 EDT 1991 · Astrophysical Journal; (United States)

DOI:https://doi.org/10.1086/170145· OSTI ID:5261377

Rubin, R H; Simpson, J P; Haas, M R; Erickson, E F ^[1]

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1. NASA, Ames Research Center, Moffett Field, CA (USA)

New ionization and thermal equilibrium models for the ionized gas in the Orion Nebula with an axisymmetric two-dimensional 'blister' geometry/density distribution are presented. The HII region is represented more realistically than in previous models, while the physical detail of the microphysics and radiative transfer of the earlier spherical modeling is maintained. The predicted surface brightnesses are compared with observations for a large set of lines at different positions to determine the best-fitting physical parameters. The model explains the strong singly ionized line emission along the lines of sight near the Trapezium. 105 refs.

• OSTI ID: 5261377
• Journal Information: Astrophysical Journal; (United States), Vol. 374; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
H2 REGIONS
IONIZED GASES
MATHEMATICAL MODELS
ABUNDANCE
BRIGHTNESS
COMPARATIVE EVALUATIONS
EMISSION SPECTRA
LTE
MASS DISTRIBUTION
RADIATION TRANSPORT
COSMIC RADIO SOURCES
DISTRIBUTION
EQUILIBRIUM
EVALUATION
FLUIDS
GASES
OPTICAL PROPERTIES
PHYSICAL PROPERTIES
SPATIAL DISTRIBUTION
SPECTRA
640105* - Astrophysics & Cosmology- Galaxies